SystemClock
Time related delegates used to improve testability of the code
Allows the setting of a custom Thread.Sleep implementation for testing.
By default this will be a call to Sleep
Allows the setting of a custom async Sleep implementation for testing.
By default this will be a call to Delay
Allows the setting of a custom DateTime.UtcNow implementation for testing.
By default this will be a call to UtcNow
Resets the custom implementations to their defaults.
Should be called during test teardowns.